list,map的疑问

　　代码：

package com.wyl;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

public class aaa {
	public static void main(String[] args) {
		// location 1
		List<Map<String,Object>> list = new ArrayList<Map<String,Object>>();
		Map<String,Object> map = new HashMap<String,Object>();
		String a = "23";
		System.out.println(a);
		for(int i=0;i<10;i++){
			//location 2
//			Map<String,Object> map = new HashMap<String,Object>();
			map.put("age", "xiaoming:"+i);
			System.out.println("=========:"+i);
			list.add(map);
		}
		Iterator it = list.iterator();
		while(it.hasNext()){
			Map m = (Map)it.next();
			String age =  (String) m.get("age");
			System.out.println("age:"+age);
		}
	}
}

　　分别在location1和location2出实例化出map，打印出来的数值就是不一样。

问题应该处在list上：

下面是一个list的Demo：

package com.wyl;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

public class listDemo {
	public static void main(String[] args) {
		List list = new ArrayList<String>();
		Map map = new HashMap<String, Object>();
		map.put("age", 234);
		map.put("name", "小明");
		list.add(map);
		Iterator it2 = list.iterator();
		while(it2.hasNext()){
			System.out.println("the first:"+it2.next());
		}
		System.out.println("======================"+list.size());
		map.put("we", "wyl");
		list.add(map);
		System.out.println("list.size:"+list.size());
		Iterator it = list.iterator();
		while(it.hasNext()){
			System.out.println("the next:"+it.next());//诡异的的事情发生了
		}
		System.out.println(map.size());
	}
}

　　打印结果：

the first:{name=小明, age=234}
======================1
list.size:2
the next:{name=小明, age=234, we=wyl}
the next:{name=小明, age=234, we=wyl}
3

　　自己多试了几遍，应该跟Java的值传递相关的基础知识有关，下面是listDemo02:

package com.wyl;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

public class listDemo2 {
	public static void main(String[] args) {
		Map<String,Object> map = new HashMap<String,Object>();
		List<Map<String,Object>> list = new ArrayList<Map<String,Object>>();
		map.put("name", "夏末");
		map.put("age", 26);
		list.add(map);
		Iterator it = list.iterator();
		while(it.hasNext()){
			System.out.println("the first:"+it.next()+"====");//诡异的的事情发生了
		}
		map.put("age", 30);//修改年岁
		Iterator it2 = list.iterator();//迭代出list的内容
		if(it2.hasNext()){
			System.out.println("the next :"+it2.next());//这个跟Java的值传递有关
			System.out.println("list的size():"+list.size());
		}else{
			System.out.println("==========");
		}

	}
}

　　打印结果：

the first:{age=26, name=夏末}====
the next :{age=30, name=夏末}
list的size():1